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Hello Sheep.

No one is counting from 0. A single topological step means depth 1.
There is no topological step from a given line to itself.

I know that arrays are confusing in some old programming languages (I
also programmed in ANSI C and Pascal) and sometimes we are obliged to
change outputs because such limitations of data structure.

However, I read lots of papers using R3 and I always understood this
radius as 3 steps away, not 2. I also think that in my MSc
dissertation wrote that R3 (3 steps) is the local standard radius
(which is wrong).

These things (interpretations, implementations) must be clear.

That is why I reinforce that academic software must be properly
published AND cited - because it is part of the methodology you use in
experiments. I think we must put it in our software licence "cite it,
otherwise do not use it".

Regards!
Lucas



On 19/12/05, Nick Dalton <[log in to unmask]> wrote:
> Hi the code in axman was designed to be output compatible with the
> fortran code. as a 'C' programmer I found it an odd switch ( and
> still do).
>
> People typically count from one (1,2,3,4) it's only C programmers (
> and their children) that count from 0. Fortran and Pascal (object
> pascal being the language of Axman) use 1 based indexs for arrays and
> so number systems.  Everything also had to be compatible with the
> output of the social logic of space ( with the D value).
>
> Zero depth makes sense to me but non programmers got there first.
>
> so R2 = r3, r3=r4 and r2=r1, which can be said to eliminate a problem ( no r1).
>
> Using R2 (ie old R3 )You may noticed more glitches in radius 2 due to
> poor micro-structure.
>
> sheep
>
> >Dear Lucas,
> >
> >Yes, this is the same in Depthmap: R2 is the equivalent of R3 in axman.
> >
> >I have always said that this makes sense: two steps away is to my
> >mind R2, not R3.
> >
> >As for handling low numbers of lines within (Depthmap's) radius two,
> >undefined values (nulls) are given in the (small number of) cases
> >where there are too few lines to calculate RRA.
> >
> >Alasdair
> >
>